iOS - 長按圖片識別圖中二維碼

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// 長按圖片識別二維碼 

    UILongPressGestureRecognizer *QrCodeTap = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(QrCodeClick:)];

    [self.view addGestureRecognizer:QrCodeTap];

 

- (void)QrCodeClick:(UILongPressGestureRecognizer *)pressSender {

    

    if (pressSender.state != UIGestureRecognizerStateBegan) {

        return;//長按手勢只會響應一次

    }

    

//    MJPhoto *photo = _photos[_currentPhotoIndex];

    // 再讀取

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, 0);

    

    CGContextRef context = UIGraphicsGetCurrentContext();

    

    [self.view.layer renderInContext:context];

    

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    CIImage *ciImage = [[CIImage alloc] initWithCGImage:image.CGImage options:nil];

    CIContext *ciContext = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}]; // 軟體渲染

    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:ciContext options:@{CIDetectorAccuracy : CIDetectorAccuracyHigh}];// 二維碼識別

    

    NSArray *features = [detector featuresInImage:ciImage];

    

    if (features.count) {

        

        for (CIQRCodeFeature *feature in features) {

            NSLog(@"qrCodeUrl = %@",feature.messageString); // 列印二維碼中的資訊

            qrCodeUrl = feature.messageString;

        }

        

        // 初始化彈框 第一個參數是設定距離底部的邊距

        alertview = [[RomAlertView alloc] initWithMainAlertViewBottomInset:0 Title:nil detailText:nil cancelTitle:nil otherTitles:[NSMutableArray arrayWithObjects:@"儲存圖片",@"識別圖中二維碼",nil]];

        alertview.tag = 10002;

        // 設定彈框的樣式

        alertview.RomMode = RomAlertViewModeBottomTableView;

        // 設定彈框從什麼位置進入 當然也可以設定什麼位置退出

        [alertview setEnterMode:RomAlertEnterModeBottom];

        // 設定代理

        [alertview setDelegate:self];

        // 顯示 必須調用 和系統一樣

        [alertview show];

    } else {

        NSLog(@"圖片中沒有二維碼");

    }

 

}

 

#pragma mark -- RomAlertViewDelegate 彈框識別圖中二維碼

- (void)alertview:(RomAlertView *)alertview didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    if (alertview.tag == 10002) {

        if ([alertview.otherTitles[indexPath.row]  isEqualToString:@"儲存圖片"]) {

            NSLog(@"儲存圖片");

            [self saveButtonPressed];

        }else if ([alertview.otherTitles[indexPath.row] isEqualToString:@"識別圖中二維碼"]){

            NSLog(@"識別圖中二維碼");

 

            // 隱藏

            [alertview hide];

            [self leftBackButtonPressed];

            

            AppDelegate *delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];

            if([delegate.window.rootViewController isKindOfClass:[UITabBarController class]]){

                UITabBarController *tabBarController = (UITabBarController *)delegate.window.rootViewController;

                UINavigationController *navigationController = [tabBarController selectedViewController];

                UIViewController *vc = navigationController.topViewController;

                //對結果進行處理跳轉網頁

                ADWebViewViewController *controller = [[ADWebViewViewController alloc] init];

                controller.m_url = qrCodeUrl;

                controller.hidesBottomBarWhenPushed = YES;

                [vc.navigationController pushViewController:controller animated:YES];

            }

        }

    }

}

iOS - 長按圖片識別圖中二維碼